Its really up to the individual dynamic between partners.

Ive had lots of different dominants before, they all had their own way of utilizing honorific titular distinctions, even if their way was to exclude them.

I personally have a tendency to reserve "Master" for when I am speaking directly to my Owner, and Sir or Maam for those I respect or sence dominance from who have not instructed me to do otherwise, but I am under no specfic orders to do so.